3D beamforming trials with an active antenna array

Koppenborg, Johannes; Halbauer, Hardy; Saur, Stephan; Hoek, Cornelis

doi:10.1109/wsa.2012.6181190

Cited by 78 publications

(41 citation statements)

References 2 publications

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“…Theoretical research has shown that the deployment of UPA topology used in BS antenna array can greatly exploit the vertical domain and adjust the beam direction in 3D space feasibly [20]. The orientation of a beam is determined by downtilt γ t and azimuth θ t , as shown in Figure 3.…”

Section: Basic Beam Setmentioning

confidence: 99%

“…This challenges the traditional channel model and transmission techniques. In recent years, three-dimensional (3D) MIMO techniques, which fully exploit the degrees of freedom in 3D space, have attracted http://asp.eurasipjournals.com/content/2014/1/111 more and more attention [9][10][11][12][13][14][15][16][17][18][19][20]. Compared with 2D MU-MIMO, the 3D MU-MIMO system is able to simultaneously serve several users who have the same azimuth but are located at different heights and therefore improves transmission efficiency greatly, as shown in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of double codebook based on 3D dual-polarized channel for multiuser MIMO system

Han

Jin

et al. 2014

EURASIP J. Adv. Signal Process.

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This paper proposes a precoding method based on double codebook for multiuser three-dimensional multiple-input multiple-output (3D MIMO) system deployed with dual-polarized antenna array. Considering the block diagonal feature of the transmit correlation matrix of 3D dual-polarized channel, we adopt the double codebook structure, where the precoding matrix is composed of an inner long-term matrix and an outer short-term matrix. Then, we introduce a set of 3D beams which possess good discrimination in horizontal and vertical domains to be the basic beam set and adopt a topology describing the 3D beam set to illustrate the angle information in an intuitive way. For the purpose of multiuser transmission, we also propose a corresponding limited channel information feedback scheme and a user scheduling criteria based on this double codebook structure. Simulation results demonstrate that the precoding method based on double codebook for the dual-polarized 3D MIMO system effectively improves system throughput compared with 2D transmission scheme.

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Section: Basic Beam Setmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of double codebook based on 3D dual-polarized channel for multiuser MIMO system

Han

Jin

et al. 2014

EURASIP J. Adv. Signal Process.

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“…where γ u,c (θ 1 , ..., θ C ) is the wideband SINR of UE u in cell c given by (1). As seen, not only is γ u,c (θ 1 , ..., θ C ) a function of the downtilt angle of cell c, but it is also a function of the downtilt angles of all interfering cells c = c, c ∈ [1, ..., C].…”

Section: Algorithm 3 Downtilt Angle Selection Based On Wideband Sinrmentioning

confidence: 99%

“…Recently, there has been significant interest in enhancing wireless cellular network performance through the use of active antenna systems (AAS) [1]. Using AAS, the directivity and beamwidth of antenna array radiation patterns can be controlled dynamically in both the elevation and the azimuth dimensions.…”

Section: Introductionmentioning

confidence: 99%

Efficient adaptive vertical downtilt schemes in LTE-Advanced networks

Jiang

Hosseinian

Lee

et al. 2014

2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC)

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This work introduces efficient schemes for adaptive vertical downtilt beamforming in Long Term Evolution Advanced (LTE-A) networks equipped with active antenna systems (AAS).A framework to determine cell-specific downtilt angles is proposed and solutions are provided with affordable complexities for practical applications. Instead of utilizing a single fixed downtilt, a cell-specific downtilt is obtained and adaptively adjusted across the system, which not only increases signal strength for desired users but also provides better control of inter-cell interference in the system. System level simulation shows that the proposed schemes achieve up to 10% cell edge and 5% cell average spectrum efficiency gain compared to the baseline system with fixed downtilt without involving complex coordination among cells.

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“…As a result, the beamforming might be implemented not only in the azimuth direction, but also in the elevation direction [2]. This is known as the three-dimensional (3-D) beamforming [5,6] that can improve spectral efficiency. The 3-D beamforming requires the position knowledge of the UTs, which corresponds to the two-dimensional (2-D), i.e., angular parameters, azimuth and elevation.…”

Section: Introductionmentioning

confidence: 99%

A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

Tan

Gao

et al. 2016

Signal Processing

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Large scale/massive multiple-input multiple-output systems (LS-MIMO/massive MIMO) Multiple-input multiple-output (MIMO) Uniform cylindrical array (UCyA) a b s t r a c tIn this paper, a generalized low-complexity beamspace approach is proposed for twodimensional localization of incoherently distributed sources with a uniform cylindrical array (UCyA) in large scale/massive multiple-input multiple-output (MIMO) systems. The received signal vectors in the antenna-element space are transformed into the beamspace by employing beamforming vectors. As a beneficial result, the total dimensions of the received signal vectors are significantly reduced. In addition, it is shown that the error introduced by the transformation decreases as the number of UCyA antennas increases. The UCyA is composed of multiple uniform circular arrays (UCAs), and the beamspace array response matrices of adjacent UCAs are linearly related. Then, the linear relation is exploited to estimate the nominal elevation direction-of-arrivals (DOAs) directly and the nominal azimuth DOAs based on a lowcomplexity search algorithm. In contrast, the linear relation in the traditional approach is based on approximations and the associated search algorithm is more complicated. Numerical results demonstrate that the proposed approach outperforms the existing approach in terms of both performance and complexity in the context of massive MIMO systems.

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3D beamforming trials with an active antenna array

Cited by 78 publications

References 2 publications

Design of double codebook based on 3D dual-polarized channel for multiuser MIMO system

Design of double codebook based on 3D dual-polarized channel for multiuser MIMO system

Efficient adaptive vertical downtilt schemes in LTE-Advanced networks

A beamspace approach for 2-D localization of incoherently distributed sources in massive MIMO systems

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